v6.0.0

New

• You can now attach files to any task — photos, PDFs, spreadsheets, and
  more. Photos are automatically shrunk down before saving so they don't
  take up much space. Each file can be up to 10MB, and a task can hold
  up to 10 attachments. (Note: HEIC photos, the default format on newer
  iPhones, aren't supported yet — please share as JPEG instead.)
• Search now also looks inside your checklists, not just task titles and
  notes — and shows you where a match was found when it isn't obvious.
• Tags already got an automatic color so the same tag always looks the
  same — you can now pick your own color for any tag instead, from
  Settings → Organize → Manage Tags.

Fixed

• Recurring tasks due on the 29th, 30th, or 31st of the month could
  skip straight past a shorter month instead of landing on its last day.
• The sidebar could accidentally be collapsed down to a tiny icon strip
  on a phone, where that mode isn't meant to be available.